Dr. Gunther Witzel Profile

Dr. Gunther Witzel

Research Associate at Max Planck Insitute for Radio Astronomy

SPIE Involvement:

Author

Publications (18)

SPIE Journal Paper | 2 March 2023 Open Access

AIROPA IV: Validating point spread function reconstruction on various science cases

Sean Terry, Jessica Lu, Paolo Turri, Anna Ciurlo, Abhimat Gautam, Tuan Do, Michael Fitzgerald, Andrea Ghez, Matthew Hosek, Gunther Witzel

JATIS, Vol. 9, Issue 01, 018003, (March 2023) https://doi.org/10.1117/12.10.1117/1.JATIS.9.1.018003

KEYWORDS: Point spread functions, Stars, Astrometry, Photometry, Adaptive optics, Optical transfer functions, Data modeling, Distortion, Atmospheric modeling, Equipment

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SPIE Journal Paper | 27 September 2022

AIROPA II: modeling instrumental aberrations for off-axis point spread functions in adaptive optics

Anna Ciurlo, Paolo Turri, Gunther Witzel, Jessica Lu, Tuan Do, Breann Sitarski, Michael Fitzgerald, Andrea Ghez, Carlos Alvarez, Sean Terry, Greg Doppmann, James Lyke, Sam Ragland, Randall Campbell, Keith Matthews

JATIS, Vol. 8, Issue 03, 038007, (September 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.038007

KEYWORDS: Point spread functions, Adaptive optics, Instrument modeling, Sensors, Data modeling, Wavefronts, Calibration, Telescopes, Atmospheric modeling, Phase measurement

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Proceedings Article | 29 August 2022 Poster

AIROPA: Off-axis adaptive optics PSF reconstruction in simulation, on-bench, and on-sky.

Abhimat Gautam, Tuan Do, Andrea Ghez, Matthew Hosek, Gunther Witzel, Jessica Lu, Sean Terry, Paolo Turri, Anna Ciurlo

Proceedings Volume 12185, 121853Y (2022) https://doi.org/10.1117/12.2630629

KEYWORDS: Point spread functions, Adaptive optics, Stars, Instrument modeling, Device simulation, Calibration, Atmospheric turbulence, Atmospheric modeling, Telescopes, Photometry

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SPIE Journal Paper | 21 July 2022

AIROPA III: testing simulated and on-sky data

Paolo Turri, Jessica Lu, Gunther Witzel, Anna Ciurlo, Tuan Do, Andrea Ghez, Michael Fitzgerald, Matthew Britton, Sam Ragland, Sean Terry

JATIS, Vol. 8, Issue 03, 039002, (July 2022) https://doi.org/10.1117/12.10.1117/1.JATIS.8.3.039002

KEYWORDS: Point spread functions, Stars, Adaptive optics, Optical transfer functions, Device simulation, Atmospheric modeling, Telescopes, Calibration, Modulation transfer functions, Photometry

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Proceedings Article | 13 December 2020 Presentation

PSF reconstruction for integral field spectrographs

Anna Ciurlo, Tuan Do, Jessica Lu, Paolo Turri, Gunther Witzel, Michael Fitzgerald, Carlos Correia, Jim Lyke, Juan Carlos Guerra

Proceedings Volume 11448, 114480C (2020) https://doi.org/10.1117/12.2563124

KEYWORDS: Point spread functions, Spectrographs, Imaging systems, Adaptive optics, Stars, Algorithm development, Reconstruction algorithms, Iterated function systems, Galactic astronomy, Keck Observatory

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Proceedings Article | 10 July 2018 Presentation + Paper

Status of point spread function determination for Keck adaptive optics

P. Wizinowich, J. Lu, L. Jolissaint, G. B. Berriman, W. Best, T. Dupuy, C. Gelino, M. Liu, J. Mader, M. van Dam, A. Vayner, G. Witzel, S. Wright, S. Ragland, A. Ghez

Proceedings Volume 10703, 107031J (2018) https://doi.org/10.1117/12.2312975

KEYWORDS: Adaptive optics, Point spread functions, Calibration, Telescopes, Binary data, Wavefronts, Stars, Phase measurement, Error analysis

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Proceedings Article | 10 July 2018 Open Access

Off-axis PSF reconstruction for integral field spectrograph: instrumental aberrations and application to Keck/OSIRIS data

Jim Lyke, Randall Campbell, Andrea Ghez, Paolo Turri, Anna Ciurlo, Tuan Do, Gunther Witzel, Jessica Lu, Michael Fitzgerald

Proceedings Volume 10703, 107031O (2018) https://doi.org/10.1117/12.2314291

KEYWORDS: Point spread functions, Imaging systems, Stars, Spectrographs, Data modeling, Signal to noise ratio, Adaptive optics, Atmospheric modeling

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Proceedings Article | 10 July 2018 Open Access

Point-spread function reconstruction for integral-field spectrograph data

Tuan Do, Randy Campbell, Jim Lyke, Paolo Turri, Anna Ciurlo, Gunther Witzel, Michael Fitzgerald, Andrea Ghez, Jessica Lu

Proceedings Volume 10703, 107030I (2018) https://doi.org/10.1117/12.2314216

KEYWORDS: Point spread functions, Imaging systems, Stars, Spectrographs, Signal to noise ratio, Adaptive optics, Atmospheric modeling, Data modeling, Astronomy

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Proceedings Article | 2 September 2016 Open Access

The AIROPA software package: milestones for testing general relativity in the strong gravity regime with AO

Jessica Lu, Andrea Ghez, Gunther Witzel, Michael Fitzgerald, Breann Sitarski, Randall Campbell, Maxwell Service, Tuan Do, Matthew Britton, Keith Matthews, Mark Morris, E. Becklin, Peter Wizinowich, Greg Doppmann, James Lyke, Marc Kassis, Luca Rizzi, Sam Ragland, Scott Lilley, Rachel Rampy, Gregory Martinez, Chris Neyman

Proceedings Volume 9909, 99091O (2016) https://doi.org/10.1117/12.2233872

KEYWORDS: Point spread functions, Adaptive optics, Photometry, General relativity, Sensors, Data modeling, Stars, Optical transfer functions, Atmospheric modeling, Instrument modeling

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Proceedings Article | 26 July 2016 Open Access

Point spread function determination for Keck adaptive optics

S. Ragland, L. Jolissaint, P. Wizinowich, M. van Dam, L. Mugnier, A. Bouxin, J. Chock, S. Kwok, J. Mader, G. Witzel, Tuan Do, M. Fitzgerald, A. Ghez, J. Lu, G. Martinez, M. Morris, B. Sitarski

Proceedings Volume 9909, 99091P (2016) https://doi.org/10.1117/12.2231814

KEYWORDS: Point spread functions, Adaptive optics, Stars, Point spread functions, Adaptive optics, Stars, Telescopes, Wavefronts, Reconstruction algorithms, Algorithm development, Space telescopes, Neodymium, Mirrors

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Proceedings Article | 13 August 2014 Open Access

Modeling instrumental field-dependent aberrations in the NIRC2 instrument on the Keck II telescope

Breann Sitarski, Michael Fitzgerald, Gunther Witzel, Leo Meyer, Andrea Ghez, Randall Campbell, Jessica Lu, Keith Matthews, Peter Wizinowich, Jim Lyke

Proceedings Volume 9148, 91486T (2014) https://doi.org/10.1117/12.2057140

KEYWORDS: Iron, Wavefronts, Data centers, Adaptive optics, Point spread functions, Instrument modeling, Telescopes, Sensors, Data modeling, Cadmium sulfide

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Proceedings Article | 13 September 2012 Open Access

Modeling anisoplanatism in the Keck II laser guide star AO system

Gunther Witzel, Randall Campbell, Jessica Lu, Peter Wizinowich, Leo Meyer, Carina Cheng, Eric Becklin, Breann Sitarski, Andrea Ghez, Tuan Do, Keith Matthews, Glenn Tyler, Mark Morris, Sylvana Yelda, Michael Fitzgerald, Matthew Britton, Christopher Neyman

Proceedings Volume 8447, 844724 (2012) https://doi.org/10.1117/12.926700

KEYWORDS: Stars, Point spread functions, Adaptive optics, Laser guide stars, Electroluminescent displays, Optical transfer functions, Atmospheric modeling, Wavefronts, Atmospheric turbulence, Phase measurement

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Proceedings Article | 12 September 2012 Paper

Beating the confusion limit: the necessity of high angular resolution for probing the physics of Sagittarius A* and its environment: opportunities for LINC-NIRVANA (LBT), GRAVITY (VLTI) and and METIS (E-ELT)

B. Shahzamanian, S. Fischer, L. Moser, C. Straubmeier, M. Horrobin, M. Valencia-S., C. Iserlohe, Macarena García-Marín, N. Sabha, S. Smajic, A. Eckart, S. Rost, C. Rauch, M. Wiest, S. Yazici, I. Wank, J. Zuther, G. Witzel, C. Araujo-Hauck

Proceedings Volume 8445, 84451F (2012) https://doi.org/10.1117/12.925157

KEYWORDS: Stars, Spatial resolution, Monte Carlo methods, X-rays, Scattering, Physics, Telescopes, Statistical analysis, Infrared radiation, Near infrared

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Proceedings Article | 22 July 2010 Paper

Signatures of strong gravity with GRAVITY

N. Sabha, A. Eckart, F. Eisenhauer, A. Amorim, G. Witzel, G. Perrin, R. Buchholz, T. Paumard, M. Garcia-Marin, C. Araujo-Hauck, C. Straubmeier, M. Zamaninasab, M. Wiest, S. Fischer, M. Schöller, K. Perraut, K. Muzic, S. Yazici, W. Brandner

Proceedings Volume 7734, 77340X (2010) https://doi.org/10.1117/12.855955

KEYWORDS: Stars, Near infrared, Polarization, Interferometry, Infrared radiation, Polarimetry, Infrared imaging, Synchrotrons, Interferometers, Telescopes

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Proceedings Article | 28 July 2008 Paper

The LINC-NIRVANA Fringe and Flexure Tracker: testing piston control performance

Evangelia Tremou, Bettina Lindhorst, Steffen Rost, Gunther Witzel, Andreas Eckart, Christian Straubmeier, Yeping Wang, Thomas Bertram

Proceedings Volume 7013, 701338 (2008) https://doi.org/10.1117/12.787896

KEYWORDS: Point spread functions, Sensors, Mirrors, Control systems, Actuators, Device simulation, Filtering (signal processing), Telescopes, Atmospheric optics, Atmospheric modeling

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Proceedings Article | 28 July 2008 Paper

Prospects for observing the Galactic Center: combining LBT LINC-NIRVANA observations in the near-infrared with observations in the mm/sub-mm wavelength domain

Andreas Eckart, Tom Herbst, Leonhard Meyer, Mohammad Zamaninasab, Evangelia Tremou, Helmut Wiesemeyer, Gunther Witzel, Christian Straubmeier, Koraljka Muzic, Stuart Vogel, Steffen Rost, Thomas Bertram, Lorant Sjouwerman, Sabine König, Rainer Schödel, Devaky Kunneriath

Proceedings Volume 7013, 70134L (2008) https://doi.org/10.1117/12.787557

KEYWORDS: Stars, Near infrared, Infrared imaging, Interferometry, Adaptive optics, Telescopes, X-rays, Observatories, Spatial resolution, Physics

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Proceedings Article | 28 July 2008 Paper

The LINC-NIRVANA fringe and flexure tracking system

Tom Herbst, Gunther Witzel, Bettina Lindhorst, Evangelia Tremou, Christian Straubmeier, Steffen Rost, Andreas Eckart, Thomas Bertram, Udo Beckmann, Sebastian Egner, Mario Brix, Yeping Wang, Imke Wank

Proceedings Volume 7013, 701327 (2008) https://doi.org/10.1117/12.788686

KEYWORDS: Sensors, Point spread functions, Mirrors, Interferometers, Interferometry, Adaptive optics, Cameras, Telescopes, Actuators, Staring arrays

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Proceedings Article | 28 July 2008 Paper

The LINC-NIRVANA Fringe and Flexure Tracker: the testbed interferometer

Steffen Rost, Andreas Eckart, Gunther Witzel, Yeping Wang, Evangelia Tremou, Imke Wank, Thomas Bertram, Bettina Lindhorst, Christian Straubmeier

Proceedings Volume 7013, 701337 (2008) https://doi.org/10.1117/12.788980

KEYWORDS: Point spread functions, Interferometers, Actuators, Mirrors, Telescopes, Control systems, Interferometry, Servomechanisms, Beam splitters, Light sources

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Showing 5 of 18 publications

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